Risks

A sudden and large drop in carbs can cause short-term side effects, such as:

• Constipation.
• Headache.
• Muscle cramps.

Severe limits to carbs can cause your body to break down fat into ketones for energy, leading to ketosis. Ketosis can cause side effects such as bad breath, headache, tiredness, weakness and flu-like symptoms.

It's not clear what long-term health risks a low-carb diet may pose. If you limit carbs in the long term, it may cause you to not have enough of some vitamins or minerals and to have digestive issues.

There are some concerns that eating more fat and protein from animal sources when following a low-carb diet may raise your risk of heart disease or some cancers. But more research is needed to see if it raises your risk of these conditions.

If you opt to follow a low-carb diet, think about the fats and proteins you choose. Limit foods with saturated and trans fats, such as meat and high-fat dairy products. These foods may increase your cholesterol and your risk of heart disease. Consider more plant-based nutrients instead.